Cannot run simulation in BEopt 2.8, the same model was working in 2.7

beopt
kiva

asked 2018-06-19 21:58:28 -0500

lolo
41 ●1

updated 2018-06-20 10:07:00 -0500

Jason DeGraw

2208 ●6 ●10 https://github.com/jasondegraw

6/18/2018 11:21 PM:  01.xml:  Warning: The building has no cooling equipment but a cooling setpoint is specified; the simulation will proceed without a cooling system.
6/18/2018 11:21 PM:  01.xml:  Error: ** Severe  ** Kiva: Solution did not converge after 0 iterations. The final residual was: (-nan(ind)).
6/18/2018 11:21 PM:  01.xml:  Error: **  Fatal  ** Kiva: Errors discovered, program terminates.
6/18/2018 11:21 PM:  04.xml:  Warning: The building has no cooling equipment but a cooling setpoint is specified; the simulation will proceed without a cooling system.
6/18/2018 11:21 PM:  03.xml:  Error: ** Severe  ** DualSetPointWithDeadBand: Unanticipated combination of heating and cooling loads - report to EnergyPlus Development Team
6/18/2018 11:21 PM:  03.xml:  Error: **   ~~~   ** occurs in Zone=FINISHEDBASEMENT_1 During Warmup & Sizing, Environment=PLANT DD, at Simulation time=01/01 00:00 - 00:10
6/18/2018 11:21 PM:  03.xml:  Error: **   ~~~   ** LoadToHeatingSetPoint=NAN, LoadToCoolingSetPoint=NAN
6/18/2018 11:21 PM:  03.xml:  Error: **   ~~~   ** Zone Heating Set-point=20.00
6/18/2018 11:21 PM:  03.xml:  Error: **   ~~~   ** Zone Cooling Set-point=25.56
6/18/2018 11:21 PM:  03.xml:  Error: **   ~~~   ** Zone TempDepZnLd=592.46
6/18/2018 11:21 PM:  03.xml:  Error: **   ~~~   ** Zone TempIndZnLd=NAN
6/18/2018 11:21 PM:  03.xml:  Error: **   ~~~   ** Zone ThermostatSetPoint=0.00
6/18/2018 11:21 PM:  03.xml:  Error: **  Fatal  ** Program terminates due to above conditions.
6/18/2018 11:21 PM:  04.xml:  Error: ** Severe  ** Kiva: Solution did not converge after 0 iterations. The final residual was: (-nan(ind)).
6/18/2018 11:21 PM:  04.xml:  Error: **  Fatal  ** Kiva: Errors discovered, program terminates.
6/18/2018 11:21 PM:  02.xml:  Error: ** Severe  ** DualSetPointWithDeadBand: Unanticipated combination of heating and cooling loads - report to EnergyPlus Development Team
6/18/2018 11:21 PM:  02.xml:  Error: **   ~~~   ** occurs in Zone=FINISHEDBASEMENT_1 During Warmup & Sizing, Environment=PLANT DD, at Simulation time=01/01 00:00 - 00:10
6/18/2018 11:21 PM:  02.xml:  Error: **   ~~~   ** LoadToHeatingSetPoint=NAN, LoadToCoolingSetPoint=NAN
6/18/2018 11:21 PM:  02.xml:  Error: **   ~~~   ** Zone Heating Set-point=20.00
6/18/2018 11:21 PM:  02.xml:  Error: **   ~~~   ** Zone Cooling Set-point=25.56
6/18/2018 11:21 PM:  02.xml:  Error: **   ~~~   ** Zone TempDepZnLd=583.36
6/18/2018 11:21 PM:  02.xml:  Error: **   ~~~   ** Zone TempIndZnLd=NAN
6/18/2018 11:21 PM:  02.xml:  Error: **   ~~~   ** Zone ThermostatSetPoint=0.00
6/18/2018 11:21 PM:  02.xml:  Error: **  Fatal  ** Program terminates due to above conditions.
6/18/2018 11:21 PM:  05.xml:  Error: ** Severe  ** DualSetPointWithDeadBand: Unanticipated combination of heating and cooling loads - report to EnergyPlus Development Team
6/18/2018 11:21 PM:  05.xml:  Error: **   ~~~   ** occurs in Zone=FINISHEDBASEMENT_1 During Warmup & Sizing, Environment=PLANT DD, at Simulation time=01/01 00:00 - 00:10
6/18/2018 11:21 PM:  05.xml:  Error: **   ~~~   ** LoadToHeatingSetPoint=NAN, LoadToCoolingSetPoint=NAN
6/18/2018 11:21 PM:  05.xml ...

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answered 2018-06-20 09:40:38 -0500

shorowit

10956 ●181 ●9 https://www.nrel.gov/b...

In BEopt 2.8, we switched to a new foundation heat transfer model (Kiva). Unfortunately, there's an issue that occasionally crops up where the radiation heat transfer in EnergyPlus causes temperature oscillations when using Kiva. This issue is being worked on right now.

Long story short, the easiest way to workaround this issue is to revert to the old foundation heat transfer model that was used in BEopt 2.7. To do this, go to C:\Program Files (x86)\NREL\BEopt_2.8.0\Modeling\sim.py, search for the line that says self.use_kiva = True and change it to self.use_kiva = False. Then re-run your simulation(s).

It would also help if you could email your project file to beopt@nrel.gov.